Pitman and crank-pin connection for multicylinder engines.



. E. M. KELLER.

PITMAN AND CRANK PIN CONNECTION FOR MULTICYLINDER ENGINES.

APPLICATION FILED APR. 10. I916.

1,200,733. I Patented Oct. 10, 1916.

WWI mow EDWARD M. KELLER, OF DETROIT, MICHIGAN.

PITlVIAN AND CRANK-PIN CONNECTION FOR MUL'IICYLINDER ENGINES.

Specification of Letters Patent.

Patented Oct. 10, 1916.

Application filed April 16, 1916. Serial No. 90,251.

To all whom it may concern:

Be it known that I, EDWARD M. KELLER, citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, haveinvented certain new and useful Improvements in Pitman and Crank-Pin Connections for Multicylinder Engines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a pitman and crank connection, and the primary object of my invention is to provide anti-frictional connections that permit of a plurality of pitmen being held in engagement with a single crank or wrist pin for imparting movement to the driven shaft of a multi-cylinder internal combustion engine.

A further object of my invention is to provide pitman and crank connections wherein the parts are assembled with a view of reducing the cost of manufacture, and at the same time retain the features by which durability, simplicity of construction, and ease of assembling are secured.

To these ends my invention resides in the novel construction, combination and arrangement of parts to be hereinafter specifically described and then claimed.

Reference will now be had to the drawing, wherein Figure 1 is a front elevation of a multicylinder internal combustion engine having the pitmen thereof connected in accordance with my invention; Fig. 2 is a cross sectional view taken on the line IIII of Fig. 1; Fig. 3 is an enlarged elevation of the converging ends of pitmen, and Fig. 4 is an enlarged perspective view of the end of a pitman.

In the drawing, 1 denotes a cylindrical frame having a wall 2 affording a bearing for a shaft 3 which is concentric with said frame. Mounted on the frame 1 are a plurality of radially disposed internal combustion engine cylinders 4. These cylinders being of a conventional form having water jackets, intake and exhaust ports, spark plugs, and such parts or accessories as are common to the cylinders of internal combustion engines.

Mounted upon the end of the shaft 3, within the frame 1, is a wheel or head 5 provided with an eccentrically disposed crank or wrist pin 6 surrounded by an outstand- 1ng annular flange 7, said flange cooperat- 1ng wlth the head 5 1n forming a cylindrical housing for the heads 8 of pitmen 9 connected to the pistons within the cylinders 4. The heads 8 of the pitmen. 9 are of greater width than said pitmen, thereby providing side shoulders 10 for anti-frictional bearings 11 adapted to engage the inner walls of the flange 7 and the inner walls of a flange 12 forming part of the cap 13 mounted upon a rectangular portion 14 of the crank or wrist pin 6. The cap 13 cooperates with the flange 7 in forming a housing for the heads 8 and said heads have concave faces 15 provided with anti-frictional bearings 16 engaging the periphery of the crank or wrist p The cap 13 is retained upon the rectangular portion 14 of the crank or wrist pin 6 by a plurality of offset arms 17 carried by the pitmen 9. The outer ends of the arms 17 are fitted over studs 18 on the sides of the pitmen 9 and said arms are retained in engagement with said studs by screw bolts 19 or other fastening means. The inner ends of the arms 17 are apertured as at 20 to engage over a pin 21, formed by reducing the outer end of the crank or wrist pin 6, and a nut 22 is mounted upon the pin 21 to retain the apertured ends of the arms thereon. The offset arms 17 prevent accidental displacement of the heads 8 of the pitmen relative to the crank or wrist pin 6, yet permitting of heads 8 adjusting themselves relative to the periphery of the crank, while the pitmen 9 freely shift between the confronting edges of the flanges 7 and 12 of the housing.

I attach considerable importance to the arms 17 as otherwise it would be practically impossible to maintain the heads 8 of the pitmen in proper relation to the crank or Wrist pin,'whereby when the engine is placed in operation a rotary movement will be imparted to the shaft 3 through the medium of the head and crank on the end of said shaft.

It is thought that the operation and utility of the pitman connections will be understood without further description, and while in the drawing there is illustrated a preferred embodiment of my invention, it is to be understood that the structural elements are susceptible to such variations and modifications as fall Within the scope of the appended claims.

WVhat I claim is 1. The combination of a crank pin, a housing surrounding said crank pin, pitmen having heads in said housing in engagement With said crank pin, and arms carried by said pitmen and loosely mounted on the end of said crank pin.

2. The combination of a crank pin having a reduced end, a housing surrounding said crank pin, pitmen extending into said housing and having heads, anti-frictional bearings between said heads and said crank pin and said heads and said housing, and arms carried by said pitmen and loosely mounted on the reduced end of said crank pin.

3. In a multi-cylinder engine having radially disposed cylinders and converging pitmen, a shaft housing, a crank pin Within said housing, said pitmen having heads Within said housing provided With side shoulders, anti-frictional bearings in the shoulders of the pitman head against said housing, anti-frictional bearings in the ends of the pitman head against said crank pin, and arms carried by said pitmen and loosely mounted on the end of said crank pin.

In testimony whereof I aflix my signature in the presence of two Witnesses.

EDl/VARD M. KELLER.

Vitnesses KARL H. BUTLER, ANNA M. Donn.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

